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280 + 500 = 780

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โˆ™ 2016-11-05 03:43:26
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Q: By using compatible numbers estimate 287 plus 491?
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280+400


Can you show us some working for this compatible numbers to estimate 212 plus 347?

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What pair of addends forms compatible numbers in the expression 6.1+8.4+1.6?


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